package com.guo.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @Auther Heart Guo
 * @Date 2021/12/24-11:32
 */
//SqlSessionFactory ---> SqlSession
public class MyBatisUtils {

    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            //使用MyBatis第一步：获取SqlSessionFactory对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //既然有了SqlSessionFactory,顾名思义，我们就可以从总获得SqlSession的实例了
    //SqlSession 完全包含了面向数据库执行 SQL 命令所需的所有文件
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
}
